Yi Ping, Xiong Ying, Guo Shaoyun
Appl Opt. 2015 Dec 1;54(34):10000-8. doi: 10.1364/AO.54.010000.
In this paper, the effects of the molecular weight of a polycarbonate (PC) matrix on the phase morphology and optical properties of a PC/styrene-co-acrylonitrile (SAN) blend were investigated. A scanning electron microscope is used to analyze the phase morphology of the blends, and Mie scattering theory is used to analyze the changing laws of the optical properties of PC/SAN blends with the increasing of PC molecular weight. Results show that the average particle diameter is not strongly changed with different PC molecular weight because the values of the viscosity ratios are very close to each other. But it is obvious that the number of large particles gradually reduced while small particles (especially d<2 μm) significantly increased with the increasing of PC molecular weight. And the increase in small particles will result in an increase in backward scattering so the transmittance of PC/SAN blends decreases with the increase of PC molecular weight. However, the balance of the scattering coefficients and the number concentration of particles eventually lead to the haze of the blends being very close, despite having different PC molecular weights. Meanwhile, the photographs of scattering patterns indicate that the PC/SAN blends whose component weight ratios are fixed at 70:30 have excellent antiglare properties, despite the changes in molecular weight of the PC matrix.
本文研究了聚碳酸酯（PC）基体的分子量对PC/苯乙烯-丙烯腈共聚物（SAN）共混物的相形态和光学性能的影响。采用扫描电子显微镜分析共混物的相形态，利用米氏散射理论分析PC/SAN共混物光学性能随PC分子量增加的变化规律。结果表明，由于粘度比的值非常接近，不同PC分子量下平均粒径变化不大。但很明显，随着PC分子量的增加，大颗粒数量逐渐减少，而小颗粒（特别是d<2μm）显著增加。小颗粒的增加会导致后向散射增加，因此PC/SAN共混物的透光率随PC分子量的增加而降低。然而，尽管PC分子量不同，但散射系数与颗粒数浓度的平衡最终导致共混物的雾度非常接近。同时，散射图案照片表明，尽管PC基体分子量发生变化，但组分重量比固定为70:30的PC/SAN共混物具有优异的防眩光性能。
